This is wrong. 
Chlorine evaporates when you boil water. 
It even evaporates when you just let water sit, but takes longer. 

I see. 
Now you see and read it. 
> Boiling water can only remove solids and bacteria, meaning it will not remove harmful substances such as chlorine and lead from tap water.
https://mytapscore.com/blogs/tips-for-taps/should-i-boil-my-tap-water

IamSINGLE

We all do. Some chemicals have high vapor pressure and can be boiled off faster than the water!

OriginalSize

science

Tap water is safer for drinking than bottled water, says new research

So, you mean by only boiling you can avoid chemicals. Interesting. 
You need to pick up your science books again, 😉